Dehydrator spool roller

This is a very simple filament spool roller to be used in a dehydrator. Just three wheels rolling in a two-sided groove. And a ring to keep the wheels more or less in place. It is useful to keep some filaments like Nylon very dry. Other filaments can get stringy when wet, but wet Nylon ruins you print.

I didn't invent this, I just copied it from the microwave oven :-). The grooves are there because both the dehydrator bottom and the spool outside are not smooth enough for the small wheels.

A redesign could even have printed axis, but this works for me.